Woven wire screen



Dec. 17, 1935. R. w. DISBRO Er AL 2,024,306

WOVEN WIRE SCREEN Filed June 19, 1931 T h 7 z 3/U u hi U U 2 A i g I W INVENTORJ fogerUDzlsZro "'r/ y 723271 306%1.

ATTO EYJ.

Patented Dec. 17, 1935 s'iTE accents 'WQVIEN WERE SCREEN Roger W. Disbro, Shaker Heights, and John Boehm, University Heights, Ohio, assigncrs to The W. S. 'llyler Company, Cleveland, (Dhio, a

corporation of Ohio Application June 19, 1931, Serial No. 545,438

ll (Claim. (ill. 209-403) The present invention, relating as indicated to a woven wire screen and method of making same, is particularly directed to a new and improved woven screen of the type in which a number of series of transverse, wires are interwoven with lengthwise wires, the transverse wires being arranged in spaced bands and the intervals between the bands being several times the interval or the spacing between the separate wires in each band. The principal object of the invention is the provision of a screen of the type described in which the accuracy and uniformity of the mesh can be maintained throughout the life of the screen, while a further object of the invention is a provision of a simple and economical method of manufacturing our improved screen. To the accomplishment of the foregoing and related ends said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims.

The annexed drawing and the following description set forth in detail one method and one product constituting, however, but one of various applications of the. principle of our invention.

In said annexeddrawing:

Fi 1 is a plan view of our improved screen; Fig. 2 is a sectional view of the screen shown in Fig. 1 taken on a plane indicated by the line 2-2; Fig. 3 is a transverse sectional view of the screen of Fig. 1 taken on a plane indicated by the line 3-3; Fig. 4 is a side elevation of one means for preliminarily crimping the lengthwise wires; Fig. 5 is a side elevation of a modification of our invention; and Figs. 6 and 7 are further modifications of the same.

In the screen of the type shown in Fig. 1, a series of lengthwise or warp wires l arranged in parallel relation are interwoven with bands 2, each band consisting of two, three or more transverse wires 3. The diificuity in the manufacture and use of a screen of this general type arisesfrom the tendency of the transverse wires 3 to move lengthwise of the wires I changing the spacing between the crimped wires and allowing the whole screen to become loose and the lengthwise wires to change their relationship, destroying the accuracy. It has been attempted to weld the transverse wires to the warp wires to prevent slipping of the transverse wires, but this introduces another objection since the welding heat destroys the temper of the warp wire upon the weld and causes the wires to break at these points. If welding is to be relied upon to maintain the wires in proper spaced relation, such welding must occur at a relatively large number of points. The cost of producing such a large number of welds makes the cost of this method almost prohibitive.

In our improved screen, we preliminarily crimp ii the longitudinal wires i either between crimping rolls 6 and 5, (see Fig. i), or by any other suitable means, to produce the bends or knuckles ii,

i and 8 into which the transverse wires 3 interlock when woven across the series of lengthwise re parallel wires. The rolls 5 and 5 are provided with inset teeth iii, ii, i2, i3 and it so arranged about the periphery of the roll that they cooperate to produce the bends referred to, leaving a space on the wire adjacent to such bends straight iii anduncrimped and then producing a second series of crimps in definite spaced relation to the first.

If desired, the crimping rolls may be so arranged and the teeth may be so formed that the wire is bent very slightly or niched, as at iii, intermediate the true bends in the manner shown in Fig. 5 or, if desired, the entire wire may be crimped as shown in Fig. 6 although for most purposes we prefer to crimp the wire in the manner illustrated in Fig. 4 and Fig. 2.

After the warp wires have been thus preliminarily crimped, the transverse wires 3 are interwoven with the lengthwise wires and fall into the bends or knuckles formed by the crimp- 80 mg operation and are there locked and engaged securely, so that they cannot tend to move longitudinally of the screen when the screen is in use, thus destroying the accuracy of the screen.

A further decided advantage arising from the employment of the hereinbefore described method of making a screen of the character described is that by crimping the warp wires the amount of crimp or bend necessary in the weft wires is considerably reduced. This reduction of the 40 bend or crimp in the weft wires enables us to usea. much better grade of material for these wires.

When the weft wires must be bent or crimped considerably, a soft wire must, of necessity, be employed, but with the amount of such bending or crimping reduced, a harder and more durable material may be employed which is reflected in the production of a screen of greater durability.

our and for the purpose of securing in interwoven relation the warp and weit wires so as to obviate the necessity for welding as hereinbement has been found desirable for certain classes of material. However, as illustrated in Fig. 7, for certain types or construction, the warp wires in the areas H in which the bands of weft wires 'are secured will be preferably crimped to the extent illustrated in Figs. 2, 4 and 5, while intermediately of the bands of weft wires such as at l8, the warp wires will be bent or crimped to a slighter amount. a

' Other forms may be employed embodying the features of our invention instead oi the one here explained, change being made in the form or construction, provided the elements stated by the following claim or the equivalent of such stated elements be employed, whether produced by om preferred method or by others embodying steps equivalent to those stated in the following claim.

We, therefore particularly point out and tinctly 'claim as our invention? tending hard wires, said transverse wires being. 10

deeply and equidistantly precrimpedat their points of intersection with said straight wires, and said straight wires being provided with spaced groups of equidistant precrimps inter'- locked with the crimps of said transverse wires 15 whereby the screen cloth is rigidly locked against sleaziness, said straight wires being assembled in such manner that adjacent wires have oppositely disposed crimps, the outermost crimps in said 7 straight wires having a depth less than the depth 20' of an intermediate crimp whereby the straight portions of said straight wires, between said precrimps, lie in a common flat plane.

ROGER W. DISBRO. JOHN BOEHM. 25 

